Environmental life cycle assessment of a small hydropower plant in China

PurposeSmall hydropower (SHP) in China has experienced soring development in the past two decades and has been assigned ambitious development goals recently, while its environmental performance remains unclear. This study is intended to provide a comprehensive assessment of the environmental impacts of SHP plants in China, to compare the results with its counterparts in other countries, and to identify the key factors in the mitigation of negative consequences.MethodsA life cycle assessment of a SHP plant in Guizhou Province of China was conducted in a cradle-to-grave manner following the ISO 14040 guidelines. The functional unit is defined as 1 MWh of net electricity produced by the plant. The CML 2001 method was applied to characterize the environmental impacts. The environmental impact categories considered in this study included global warming (GWP), abiotic depletion (ADP), acidification (AP), freshwater aquatic ecotoxicity (FAETP), human toxicity (HTP), and photochemical ozone creation (POCP). Further contribution analyses and sensitivity analysis was performed to identify the key contributors to each impact category during the life cycle of the plant.Results and discussionFor the case plant, the considered impacts are caused primarily by the construction stage. As for the materials and energy inputs, cement, steel, and electricity are the three dominating ones for the overall environmental impacts. Compared with SHP plants in other countries, the plant performs similar to the MW scale plants in Thailand and Japan but worse than the plant in Switzerland. Further comparison of life cycle inventories (LCIs) revealed that the quality of hydro-energy resources and acquisition of indigenous equipment technology is essential to their environmental performance. The results of the sensitivity analysis suggested that the amount of construction materials and energy consumption as well as the plant output influences its environmental performance significantly.Conclusions and recommendationsThe construction stage of the SHP plant is the most important source of environmental impacts. To minimize the impacts of this stage, optimization of the structural design and application of new construction materials and good construction practices is recommended. In addition, determining suitable installed capacity and advancing equipment technologies to ensure the optimal output is also crucial to improve the environmental performance of SHP plants in China, regarding the current serious problem of unstable operation.

[1]  Oliver Paish,et al.  Small hydro power: technology and current status , 2002 .

[2]  A. Bahaj,et al.  Carbon emissions by rural energy in China , 2014 .

[3]  Gerald Rebitzer,et al.  IMPACT 2002+: A new life cycle impact assessment methodology , 2003 .

[4]  Sheng Zhou,et al.  The trend of small hydropower development in China , 2009 .

[5]  Not Indicated,et al.  International Reference Life Cycle Data System (ILCD) Handbook - General guide for Life Cycle Assessment - Detailed guidance , 2010 .

[6]  Sergio Ulgiati,et al.  Ecological impacts of small hydropower in China: Insights from an emergy analysis of a case plant , 2015 .

[7]  Varun,et al.  LCA of renewable energy for electricity generation systems—A review , 2009 .

[8]  G. Heath,et al.  Life Cycle Greenhouse Gas Emissions of Nuclear Electricity Generation , 2012 .

[9]  Eric Johnson.  Handbook on Life Cycle Assessment Operational Guide to the ISO Standards , 2003 .

[10]  Manfred Lenzen,et al.  Errors in Conventional and Input‐Output—based Life—Cycle Inventories , 2000 .

[11]  Ting Wang,et al.  Benefit Evaluation on Energy Saving and Emission Reduction of National Small Hydropower Ecological Protection Project , 2011 .

[12]  Yohji Uchiyama,et al.  Life-cycle assessment of electricity generation options: The status of research in year 2001 , 2002 .

[13]  Charlotte Hicks.  Small hydropower in China , 2004 .

[14]  Michael Whitaker,et al.  Life Cycle Greenhouse Gas Emissions of Coal‐Fired Electricity Generation , 2012 .

[15]  Ole Jørgen Hanssen,et al.  Life cycle greenhouse gas (GHG) emissions from the generation of wind and hydro power , 2011 .

[16]  Roberto Turconi,et al.  Life cycle assessment (LCA) of electricity generation technologies: Overview, comparability and limitations , 2013 .

[17]  Gil Anderi da Silva,et al.  Life-cycle inventory for hydroelectric generation: a Brazilian case study. , 2010 .

[18]  G. Heath,et al.  Life Cycle Greenhouse Gas Emissions of Utility‐Scale Wind Power , 2012 .

[19]  Hans-Jürgen Dr. Klüppel,et al.  The Revision of ISO Standards 14040-3 - ISO 14040: Environmental management – Life cycle assessment – Principles and framework - ISO 14044: Environmental management – Life cycle assessment – Requirements and guidelines , 2005 .

[20]  E. Hertwich.  Addressing biogenic greenhouse gas emissions from hydropower in LCA. , 2013, Environmental science & technology.

[21]  J. V. Vate,et al.  Greenhouse gas emissions from hydropower: The state of research in 1996 , 1997 .

[22]  Edgar G. Hertwich,et al.  Life cycle assessment of an offshore grid interconnecting wind farms and customers across the North Sea , 2014, The International Journal of Life Cycle Assessment.

[23]  Gjalt Huppes,et al.  Methods for Life Cycle Inventory of a product , 2005 .

[24]  Shabbir H. Gheewala,et al.  Life cycle assessment of mini-hydropower plants in Thailand , 2011 .

[25]  Bryan W. Karney,et al.  Life-Cycle Inventory of Energy Use and Greenhouse Gas Emissions for Two Hydropower Projects in China , 2007 .

[26]  Lixiao Zhang,et al.  Emergy analysis of a small hydropower plant in southwestern China , 2014 .

[27]  Valerio Lo Brano,et al.  Energy performances and life cycle assessment of an Italian wind farm , 2008 .

[28]  Tania Urmee,et al.  Life cycle assessment of a community hydroelectric power system in rural Thailand , 2011 .

[29]  Bo Song,et al.  Carbon emission reduction potential of a typical household biogas system in rural China , 2013 .

[30]  Shuying Yang,et al.  A Hybrid Life-Cycle Assessment of Nonrenewable Energy and Greenhouse-Gas Emissions of a Village-Level Biomass Gasification Project in China , 2012 .

[31]  G. Keoleian,et al.  Life cycle assessment of Chinese shrimp farming systems targeted for export and domestic sales. , 2011, Environmental science & technology.

[32]  David Pennington,et al.  Recent developments in Life Cycle Assessment. , 2009, Journal of environmental management.

[33]  Zheng Yan,et al.  Present situation and future prospect of hydropower in China , 2009 .

[34]  Varun,et al.  Life cycle greenhouse gas emissions estimation for small hydropower schemes in India , 2012 .

[35]  Zengwei Yuan,et al.  Life-cycle assessment of multi-crystalline photovoltaic (PV) systems in China , 2015 .